| TemplateHaskell | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TemplateHaskellQuotes | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TraditionalRecordSyntax | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TransformListComp | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| Trustworthy | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TupleSections | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TypeApplications | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| typeChecks | Language.Haskell.Interpreter | 
| typeChecksWithDetails | Language.Haskell.Interpreter | 
| TypeFamilies | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TypeFamilyDependencies | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TypeInType | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| typeOf | Language.Haskell.Interpreter | 
| TypeOperators | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension | 
| TypeSynonymInstances | Language.Haskell.Interpreter, Language.Haskell.Interpreter.Extension |